I built one a few months ago. It reminded me of the BSIAB quite a bit.
If you like your BSIAB, you'll probably dig on the the Thor. Its like the BSIAB but a bit....fuzzier? Not exactly overdrive, not exactly distortion, and not quite fuzz. My build had qualities of each, in their own respective ways.
I built it with run-o-the-mill J201s, with about Vdd/2 on the drains. Fun little circuit.